John Mark Karr’s wacko mother tried to kill him when he was a little baby by setting him on fire, an explosive new report revealed yesterday.

Patricia Elaine Adcock, the JonBenet Ramsey suspect’s mom, “made a big round donut [of kindling] and put him in the middle of it,” said longtime Karr family friend George McCrary in an interview with ABC News.

“She just boxed the little baby in and tried to light it,” said McCrary, 76.

But Karr was saved when his brother Michael “came running in just before she got to the flammable material,” McCrary said.

Although Karr was unharmed in the incident, it apparently scarred him emotionally for life, McCrary said.

“From the time his mother tried to kill him, he’s been out-and-out paranoid that someone’s going to try and kill him or take advantage of him,” McCrary told ABC News. “He needs a psychiatrist worse than anyone I’ve ever met in my life.”

“He wanted the successful marriage that his father never had,” McCrary said. “This boy suffered his whole life. He lived from one trauma to the next.”

Adcock was 18 and a traveling evangelist when she married Wexford Karr, then 37, ABC News reported.

Sometime after attempting to set her youngest son ablaze, Adcock was committed to a mental institution.

Wexford divorced her in 1973, saying their marriage was “irretrievably broken,” according to The Atlanta Journal-Constitution. Adcock died in 2000.

Wexford Karr remarried at age 52 to a 29-year-old woman named Susan Simpson.

McCrary told ABC News that John Karr was “uncontrollable” and “possessive” as a child, throwing tantrums to get what he wanted.

He also described Karr as lazy, saying the then-teen quit a job moving furniture in a Georgia warehouse after just one day because he complained the work was too hard.

But McCrary also said Karr was “smart as hell, talented and sharp as a tack.”

And, he added, when Karr found girls he liked, “he couldn’t do enough for them. He worshipped them. He kind of treated them like a little girl of his own, dressing them and giving them presents.”